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RE: now I am really puzzled ......

Vinnie,

You have to start to be specific:

"Just got through taking it up to full mains, and the voltage never did start going back up on the 26 plate. "

What does this mean?

"At full mains I had a B+ of only 283vdc, and the reading at the 26 plate node (end of 20k resistor) was only 15vdc."

You told us that the power supply voltage was 400V. Where are you measuring?

A voltage is a difference of potential between two points. If we don't know the two points then the statement is meaningless. The voltage on the plate of the tube is called "plate voltage" and it is relative to the cathode. If you don't use specific terms we can all agree on your statement is useless.

"Any ideas of where to start looking?"

How are you establishing bias? What is the cathode voltage relative to ground and the grid voltage relative to the cathode?





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